   (with-channel req channel
     (send! channel {:status 200
                     :headers {"Content-Type" "text/event-stream"
+                              "Access-Control-Allow-Origin" "*"
                               "Cache-Control" "no-cache"
                               "Connection" "keep-alive"}
                     :body ":ok\n\n"} false)

            [org.httpkit.timer :refer [schedule-task]]))

(def channel-hub (atom {}))

(defn handle-404 []
  {:status 404

(defn handle-connections []
  {:status 200
   :headers {"Content-Type" "text/plain"
             "Access-Control-Allow-Origin" "*"
             "Cache-Control" "no-cache"
             "Connection" "close"}
   :body (str (count @channel-hub))})
